CVE-2026-63509

CRITICALNVD 8.89.9▲
EchelonGraph scoreMEDIUM confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-21. NVD baseline CVSS 8.8; sources differ by 1.1.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.

CVSS v3
8.8
EG Score
9.9CRITICALmedium confidence
EG Risk
45
EG Risk 45/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity99% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
1.0%
EPSS %ILE
62nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 20, 2026

Last Modified

September 29, 2026

Advisory Details (1)

Auto-updated Sep 3, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63509

Vendor Advisories for CVE-2026-63509(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 70× in last 7d / 330× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 554 total refreshes for this CVE.

  1. 2026-10-05 14:45 UTCVendor advisory
  2. 2026-10-05 14:45 UTCGHSA enrichment
  3. 2026-10-05 10:21 UTCVendor advisory
  4. 2026-10-05 10:21 UTCGHSA enrichment
  5. 2026-10-05 05:57 UTCVendor advisory
  6. 2026-10-05 05:57 UTCGHSA enrichment
  7. 2026-10-05 01:33 UTCEG score recompute
  8. 2026-10-05 01:33 UTCVendor advisory
  9. 2026-10-05 01:33 UTCGHSA enrichment
  10. 2026-10-04 23:22 UTCEPSS rescore
  11. 2026-10-04 20:51 UTCVendor advisory
  12. 2026-10-04 20:51 UTCGHSA enrichment
  13. 2026-10-04 16:01 UTCVendor advisory
  14. 2026-10-04 16:01 UTCGHSA enrichment
  15. 2026-10-04 11:25 UTCVendor advisory
  16. 2026-10-04 11:25 UTCGHSA enrichment
  17. 2026-10-04 07:00 UTCVendor advisory
  18. 2026-10-04 07:00 UTCGHSA enrichment
  19. 2026-10-04 02:37 UTCVendor advisory
  20. 2026-10-04 02:37 UTCGHSA enrichment
  21. 2026-10-03 21:09 UTCVendor advisory
  22. 2026-10-03 21:09 UTCGHSA enrichment
  23. 2026-10-03 16:45 UTCEG score recompute
  24. 2026-10-03 16:45 UTCVendor advisory
  25. 2026-10-03 16:45 UTCGHSA enrichment
Show 75 more
  1. 2026-10-03 14:26 UTCEPSS rescore
  2. 2026-10-03 06:35 UTCVendor advisory
  3. 2026-10-03 06:35 UTCGHSA enrichment
  4. 2026-10-03 01:36 UTCVendor advisory
  5. 2026-10-03 01:36 UTCGHSA enrichment
  6. 2026-10-02 20:59 UTCEG score recompute
  7. 2026-10-02 20:59 UTCVendor advisory
  8. 2026-10-02 20:59 UTCGHSA enrichment
  9. 2026-10-02 17:56 UTCEPSS rescore
  10. 2026-10-02 15:38 UTCVendor advisory
  11. 2026-10-02 15:38 UTCGHSA enrichment
  12. 2026-10-02 11:13 UTCVendor advisory
  13. 2026-10-02 11:13 UTCGHSA enrichment
  14. 2026-10-02 06:48 UTCVendor advisory
  15. 2026-10-02 06:48 UTCGHSA enrichment
  16. 2026-10-02 01:55 UTCVendor advisory
  17. 2026-10-02 01:55 UTCGHSA enrichment
  18. 2026-10-01 21:27 UTCEG score recompute
  19. 2026-10-01 21:27 UTCVendor advisory
  20. 2026-10-01 21:27 UTCGHSA enrichment
  21. 2026-10-01 19:50 UTCEPSS rescore
  22. 2026-10-01 14:28 UTCVendor advisory
  23. 2026-10-01 14:28 UTCGHSA enrichment
  24. 2026-10-01 10:04 UTCVendor advisory
  25. 2026-10-01 10:04 UTCGHSA enrichment
  26. 2026-10-01 05:41 UTCVendor advisory
  27. 2026-10-01 05:41 UTCGHSA enrichment
  28. 2026-10-01 01:12 UTCVendor advisory
  29. 2026-10-01 01:12 UTCGHSA enrichment
  30. 2026-09-30 20:30 UTCEG score recompute
  31. 2026-09-30 20:30 UTCVendor advisory
  32. 2026-09-30 20:30 UTCGHSA enrichment
  33. 2026-09-30 15:03 UTCEPSS rescore
  34. 2026-09-30 08:07 UTCVendor advisory
  35. 2026-09-30 08:07 UTCGHSA enrichment
  36. 2026-09-29 23:37 UTCEG score recompute
  37. 2026-09-29 23:37 UTCVendor advisory
  38. 2026-09-29 23:37 UTCGHSA enrichment
  39. 2026-09-29 06:24 UTCVendor advisory
  40. 2026-09-29 06:24 UTCGHSA enrichment
  41. 2026-09-29 02:00 UTCVendor advisory
  42. 2026-09-29 02:00 UTCGHSA enrichment
  43. 2026-09-28 21:37 UTCEG score recompute
  44. 2026-09-28 21:37 UTCVendor advisory
  45. 2026-09-28 21:37 UTCGHSA enrichment
  46. 2026-09-28 14:37 UTCEG score recompute
  47. 2026-09-28 14:37 UTCVendor advisory
  48. 2026-09-28 14:37 UTCGHSA enrichment
  49. 2026-09-28 13:51 UTCEPSS rescore
  50. 2026-09-28 10:08 UTCVendor advisory
  51. 2026-09-28 10:08 UTCGHSA enrichment
  52. 2026-09-28 05:39 UTCVendor advisory
  53. 2026-09-28 05:39 UTCGHSA enrichment
  54. 2026-09-28 01:15 UTCVendor advisory
  55. 2026-09-28 01:15 UTCGHSA enrichment
  56. 2026-09-27 20:51 UTCVendor advisory
  57. 2026-09-27 20:51 UTCGHSA enrichment
  58. 2026-09-27 16:27 UTCEG score recompute
  59. 2026-09-27 16:27 UTCVendor advisory
  60. 2026-09-27 16:27 UTCGHSA enrichment
  61. 2026-09-27 12:03 UTCVendor advisory
  62. 2026-09-27 12:03 UTCGHSA enrichment
  63. 2026-09-27 07:14 UTCVendor advisory
  64. 2026-09-27 07:14 UTCGHSA enrichment
  65. 2026-09-27 02:50 UTCEG score recompute
  66. 2026-09-27 02:50 UTCVendor advisory
  67. 2026-09-27 02:50 UTCGHSA enrichment
  68. 2026-09-26 15:59 UTCEPSS rescore
  69. 2026-09-25 19:48 UTCVendor advisory
  70. 2026-09-25 19:48 UTCGHSA enrichment
  71. 2026-09-25 17:21 UTCVendor advisory
  72. 2026-09-25 17:20 UTCGHSA enrichment
  73. 2026-09-25 09:26 UTCVendor advisory
  74. 2026-09-25 09:26 UTCGHSA enrichment
  75. 2026-09-25 05:03 UTCVendor advisory

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-63509?
CVE-2026-63509 is a critical vulnerability published on August 20, 2026. Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-63509 disclosed?
CVE-2026-63509 was first published on August 20, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63509 actively exploited?
CVE-2026-63509 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (62nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63509?
CVE-2026-63509 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.9 (CRITICAL).
How do I remediate CVE-2026-63509?
A fix for CVE-2026-63509 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63509 are linked in the Vendor Advisories panel on this page.

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